A 10-year-old girl was swimming at a Florida beach when an “unknown, toothy sea creature” chomped down on her leg, the local fire department said Tuesday.

The mysterious sea monster left a 6-inch bite on the girl’s left calf at the beach in Melbourne Monday and she was rushed by helicopter to Arnold Palmer Hospital in Orlando, the local station News 13 reported.

“Brevard County Fire Rescue’s is working a pediatric laceration to the leg by unknown toothy sea creature,” the fire department announced via Twitter.

The beach was closed soon after to ensure there were no sharks — or any other creepy creatures — in the water Monday afternoon.